A keypad is comprised of a supporting frame, a plurality of snap action domes, and a plurality of pushbuttons each overlying a dome, all of the above being integrated and formed of a single piece of elastomeric material, the pushbuttons each being surrounded by a thin piece of the material buttressing...http://www.google.fr/patents/US5311656?utm_source=gb-gplus-shareBrevet US5311656 - Keypad method of manufacture
